... selectivity characteristic ==> 选择特性 selectivity clause ==> 选择条款 selectivity coefficient ==> 选择系数 ...
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For the exceptional situations where the optimizer cannot choose an optimal query execution plan, DB2 has added features such as the SELECTIVITY clause and optimization guidelines.
对于优化器不能选择最佳查询执行计划的例外情况，DB 2已经增加了诸如selectivity子句和优化指南之类的特性。
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